Reversing the one-way bearing won't be sufficient. If you do this there will still be a tiny amount of drive to the front (since the bearing has some friction) so it would just be a really crap 4wd and not legal for 2wd.
You would need a separate electric/mechanical front braking system.
It does seem like it has potential. The front wheels on any real car do most of the work under braking, as the load transfers to the front and gives that end the most grip. It's why we have disks on the front but can cope with crappy drums on the rear.
You'd need to run different front tyres to make the most of it; the skinny ribs we run on the front of a 2wd aren't going to be much use under braking.
Then the question is how much performance is lost due to the added unsprung weight, plus the WD change that will happen with the weight of this system over the front end.
|